The Electrifying Shoctopus

Tom has Moby take him Tubb and Scooby to an old pirate ship that he discovered on the ocean floor. The boys go inside the ship and find a secret compartment in the Captain's quarters with a treasure map inside. They hear a noise and see the Electrifying Shoctopus: an octopus-shaped underwater craft piloted by Captain Squid. Captain Squid captures the boys and takes their newly found treasure map.